JSON Formatter

Beautify, minify and validate JSON

Quick Answer

JSON Formatter: Beautify, minify and validate JSON. JSON Formatter uses standard developer formulas to compute accurate results instantly.

Indent

Samples:

Input JSON

Output

{
  "user": {
    "id": 1,
    "name": "张三",
    "roles": [
      "admin",
      "editor"
    ],
    "meta": {
      "age": 30,
      "vip": true
    }
  },
  "tags": [
    "工具",
    "计算器"
  ]
}

Keys12

Max depth3

Input size119 B

Output size208 B

Size change+74.8%

JSON data types

Type	Example	Note
string	"hello"	双引号包裹，支持 \ 转义 / double-quoted
number	3.14, -2, 1e3	整数/小数/科学计数，无 NaN、Infinity
boolean	true / false	仅小写 / lowercase only
null	null	空值 / empty value
object	{"k": v}	键必须双引号 / keys double-quoted
array	[1, 2, 3]	有序列表 / ordered list, mixed types allowed

💡 JSON is strict: no trailing commas, no comments, no single quotes. Use a JSON5/YAML parser if you need those.

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How to Use

Paste or type content: drop code/text into the JSON Formatter or fill the parameters.
Choose mode/options: switch format, rules or processing as needed.
Live output: results appear instantly — nothing is submitted, data stays in your browser.
One-click copy: copy the output straight into your development environment.

Key Points

JSON Formatter is a free online developer tool — open and use, no sign-up.
All calculations run locally in your browser; your data never leaves the device.
Key capability: Beautify, minify and validate JSON.
Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

JSON Formatter formula

JSON Formatter uses standard developer formulas to compute accurate results instantly.

FAQ

How do I use the JSON Formatter?

Open the page and fill in the input fields — results update automatically. Beautify, minify and validate JSON.

Are the results accurate?

Yes. Standard formulas and conversion factors are used and verified.

Is it free? Do I need to sign up?

Completely free. No registration, login or download required.

Does it work on mobile?

Yes. The responsive design works on phones, tablets and desktops.

Is my data saved?

No. Everything runs locally in your browser.

Related Guides

Source & Updates

Based on RFC 4648, ECMA-262 and related specifications. Last updated: 2025-07

Authoritative sources:

ECMA-404 JSON data interchange syntax

Last updated: 2026-08-07

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Cite this page: YiJianSuan. JSON Formatter[EB/OL]. https://www.yijiansuan.com/en/c/dev/json-format

Results provided by this tool are for reference only and do not constitute professional advice.